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19 October 2011 The substituted [2.2] paracyclophanes as versatile platform for a design of new optical materials
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The series of novel unsymmetrical β--diketones substituted by functional groups with different donor-acceptor properties, as well as of their lanthanide complexes have been synthesized for the first time. The optical properties of these [2.2]paracyclophane-derived ligands and the lanthanide complexes were studied by UV-visible and luminescence spectroscopy. The energy of absorption maximum of these β--diketones correlates with donor-acceptor properties of functional groups and a size of the conjugated system. All β--diketonates synthesized exhibit broad emission spectra with red shifted maxima in comparison with isolated [2.2]paracyclophane moiety. The designed blue-emitting unsymmetrical β-diketones act as very efficient sensitizers of the Eu3+ emission with excitation wavelength up to 450 nm. Nonlinear optical properties have been studies for some β--diketones as well. Their average NLO susceptibility was found comparable with that of such well known NLO crystal as PNP.
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Lada N. Puntus, Elena V. Sergeeva, Dmitrii Yu. Antonov, Ivan V. Anan'ev, Konstantin A. Lyssenko, Irina S. Pekareva, François Kajzar, and Ileana Rau "The substituted [2.2] paracyclophanes as versatile platform for a design of new optical materials", Proc. SPIE 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security, 81890Y (19 October 2011);

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